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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c13c6ed6367ee83131c0a5d4f6b75233d5ac265c4d192657f716fdf6cb22fef' 
  AND token = 'dmGW3wSxL0ax3+7Uh/kToGzqS2Z7LTnbZBi2xnJGPWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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