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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e8051bd163b044b1c71bcea6d83f1d3d07cd070f7666aed2f7a2e9af60428d' 
  AND token = '15Y84OmdwyRaH81weULoblMkue5Qu2yB8a0izjMBR3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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