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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18b026a8752091e09942e04ad5241c7431f1645fd1f7611fe0025cae8e166c2' 
  AND token = 'u10qTXfEIF4inoIO5Q9iFNMA9GVm09aCpzAJqywUTi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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