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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ecb3a0a59b03f23261a68257ba44d7401666df30feaed45fc847d8b33b4ac59' 
  AND token = '7N3f53yux4zxCON+VwRVIb5J0Efta4VO2gWyzmKqrTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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