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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1afff4181342a4357f3c2339eabb0cc45c823800398ca24e65e160f30e5854' 
  AND token = '39YKm6fYl4ioh9byG6WNxrz8q2ZElg8JWIyTuXiytas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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