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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39eaa2c47fca277f855c6d57ddd2c3210f6a2bff8c135393ea77dcf88b5f1cd6' 
  AND token = '/uvZcPSosK2h2+WhLg6tQNZm2N79eRSyb/me31Mx78k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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