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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2aa7588aad53e15570e9957d6dee0716146d04c2626309cd485ac129e90c60b' 
  AND token = 'rx4aWvssb9esOQdSxdFo6Dc1plyhEB6Uy0Sk1KV2jow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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