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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d18f4f0d5b9a34f2d822b6ab9698137ff6668f09589aab1d282b1a842de5a1b' 
  AND token = '0HVuN+T2g2mlKOmJuO2kHCrxpNq1YyJ5U1W5VFh2mGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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