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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cc7b7b67aa9f9d8591eb7b5f317737fd522b815d4f5da61a5d4d512df98bcc' 
  AND token = '/pYuac0YPyy/4aVilGK1rKBHJ4FROMGCJ37x0NGzYKE=' 
  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"
    }
  }
}