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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2743cd45edc2cf84bcc6a906f1cb7a23c1dfdfe8a9d0698fb7a14c2c85fe6397' 
  AND token = '4S6C3v6GlAOHknG67elOEXX3zmzcpdjDkR8q3BSEWv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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