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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc26f1dd9370a2e7ddd76eebc56aa65f06061cd412b822230e1f4a3d3112da5' 
  AND token = '8lTuBOXcO0ZjT3UlrcDIJ6+UZkbk+Vq+W73RetYe5O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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