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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9f414a2715b036c455a41e4fb25c11eb2acefd33b9d48f5952e42e02820892' 
  AND token = 'XmHk6T72yhg7Xbr0NEx84U41QvFamH3DI610v0h55dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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