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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f54b6d0a6f7a76f7954c6d9c401c7e1073fd31b0db011d25cc4592aa8930e27' 
  AND token = 'car0W3Dq6E2Lfq1E9oKoz68qJpFQ/TYmkky17y1iJrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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