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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee871199a54589171f7dc6f002a3db0a503c58bde6f412f7f5177e5e698ffd42' 
  AND token = '+Xn92y8CvYSOTqN/sngQep+WgTqtNsgbobj3k08KB54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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