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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68648dac99e5d13532d625786a77473fc4bc40c43e8a68f923b3fdf2694d7229' 
  AND token = 'PW5MV0PtRRHg7XUToyrf17pG86uQ9OvCY380JJNxouw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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