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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa49410a4a76377848d89a6882216bbe0485c126429a6a77f43b76481bd9f24c' 
  AND token = 'M9DNQ9CQnZrTmo97WrpY0ZhWE8ORhWP/uXwhNXde0OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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