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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c504ace26111a029e3e0cd2f6061ec3960ff50d7414bb0d25a9f4afc10a451' 
  AND token = 'KZs4isiJ76VWQC8ZK+wFRZ42v/DErKPn3xmiqpnC/t0=' 
  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"
    }
  }
}