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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc346803b16f17854b6174b2cae38c6bd2d3faa24e391e690cb2ec8cb0e65053' 
  AND token = 'wc5Oa7kboXwO63Y2rgbRvJrGvxSBmsaVRKd3HEXmsg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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