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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4a6ef657a5b6250a72f8f8f5f2eaeacacb4ead50cd3bcaf956ef641ff231b2' 
  AND token = 'thHSVZ5BCVGai3klr+mMyEbPCg/pDA6EWwyeZziAPvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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