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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8041a9c1e299fc99a62a68db0a138b93052ec69e8b2bef7d8cc725afb8c2775' 
  AND token = '8iRYdPCKoYXX9xcLECxskG66c6UZlxLnu6rq0VhJFkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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