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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727d064ee13a4fc1315baad9d3493eca90dde3f9134e81d0f080fa9441145f5b' 
  AND token = 'YO75hseFiIJVTUGZd4pnfQWLpA3HY51x6vnKu4VV1qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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