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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe602c8e8528e321c19ad615feaf00aae35d6c8446e3ebb3b987f2c39f613cc' 
  AND token = 'fCZar3q3nYldoQWensyZydhet7t+N7ykOEyYBHCm2H8=' 
  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"
    }
  }
}