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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4e200ec616e4106cfdf1337aef3fef5e57161c11e60e54afd8b425d772cdb2' 
  AND token = 'cA/rFre3Njh+OTwO3rkMrxnJHLtknjguAj7d2yM24Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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