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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bfa7018d29f78d026d8e82fcdead165c956f9d92baf8848d173e878133bdce' 
  AND token = 'Zr0unny+HF7beb1P7ITBG/dR7cpOR/APqR07suB2CV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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