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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec019ae69783013d4c7f58021dfcfec4836612dcb7f12f8c994178417278b7c4' 
  AND token = 'BOQYHM55jOb5rjWwaZPBDNhh8ipjJ1n94F2forpJ/5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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