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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd407cd7cf282c93ac914a97d547f7653d20867a1f71d0af9c2e30486f314b7dc' 
  AND token = 'pHAYM0vvoRScgCHD38yYup6yH5+AmtUnINzyFTwOCaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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