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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb4c4d0bfc04c8abe0d3329e1f7e9b91e9952c25b3557b101c3c2d71bb067ea' 
  AND token = 'eyc866rPqYVJxTOXQPVokMjVo6v6os+xC/nDr4ERhh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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