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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17399e7bb7301612a92e0b5c256b708194e20ac65e4716fd56543b156a948fb' 
  AND token = '1a5irjrz0dz7eSHhQ7rhfyQzNDA19kM6SrVbYzSLZbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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