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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4a059e5c687ae821d70eb6030569fb16101b3738b54e998b582b1e0191a741' 
  AND token = 'g6yzzzfn3uHVBUGS4tWmedmbJ9oOje53PL7AZS1LuQU=' 
  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"
    }
  }
}