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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d61df3bb2bf8bfc49c5d39e268d6b74db97fb219a68eb9bf63562252c5e26d6' 
  AND token = 'a4om0TWCmp8jhSUOlg8fgsFdR6V9HHrYgPJxELjDOR0=' 
  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"
    }
  }
}