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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a490f0d00400ee9317fc98c229d60ce047bf8e0d5123d40e638d9667f84bfe3' 
  AND token = 'Yc5L9f94He+j+9qSUTg6juv4NWMN0uwiaKoG5BLq+to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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