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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3e1e494ed2aa63053f5746cbc9e65aae9e721d88d6a0502e3e6049ee801756' 
  AND token = 'OxUNpEGgplu9/0P5PkU9sXen8p4y8l9ERx0/hdISczQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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