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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f63e27793bd833906b376b4af757d0d0eb4fd40bd508f7b15a69d7612df39c' 
  AND token = 'j/VvNEKIagvX0Y12k+pqf4ofmFWqGyx9PeS6nWf5c18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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