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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc80e5e09dcadad58631e0a24ab6f8da33c5809b24af3d1e5466927e623d0d6e' 
  AND token = '9F/KsXavQUdz+lMtKma5vR87mjcuxOLhaMC+xmORi3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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