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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3194a19b0842a90b4a544f8c3059fd0c4757ee5dd0a489841d2d5c75220e9507' 
  AND token = 'LdW5+Gl7Fnq+dEmlDPab0hMNqjxWyYq67ruhMpAq2Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}