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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68547d33a8cb8a3d13dee8933e79e85ef9e1eb78c76be18545c59b973506f52' 
  AND token = 'yrxc21GTvg9yEh729Qc9BBY0NXkXvoDPZe1XCXYMhHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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