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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ea9154157e05d110e830d5e1b70b04dc306fbd8d9b1525b7502ab0e81f7814' 
  AND token = 'oqF92AL2uzGFU9J3kSdGQcy2h0noC4uwffUBLP6tCo0=' 
  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"
    }
  }
}