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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe31a78a47d267b77a697def6940d5f92c43d73ffd6b494c2cc9a3e4b5ea9e7' 
  AND token = '7iQHnoOWeSnWh5ecLPpe3I0wk499gy/O8mBXW0ruPd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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