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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f02a89c9ca0c81fc2b28484b335b763267d525c0a75f2be288ef54fccf5a68' 
  AND token = 'XtDGcYBAb0zBcs00PzQy/ZqCbbHzHowa5F/813qeULQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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