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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf36b2d156c688b63ab5c2c6965987c46401232c8df0b8ea37d0dcb1364f3cb' 
  AND token = 'dpYPy7dBP1Syc2wyDH95JfqFMmqsbhGIX1Usx1mRkUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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