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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0d75560faa3e2df3012e8e90e029bb7e05db71e8c8105fe51a8a2b8b3073b4' 
  AND token = 'UzFFQfDiSum9lqxIMOk8BoeEKtjbr4SM5gQoYIBwuek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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