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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a10a82f14b422cfeed3466b14c135326996bcf0407a100269289a58d700e2c' 
  AND token = 'ZjTQZuAuji1Q2HBzYy6gSp0d/AE3snGC0wpMF0RRh6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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