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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4329991a8c0789e60b86206a5b8c48d8d6dd00e3d87efb3b88c9ab298cdce703' 
  AND token = 'bQasSJ7J/WJiA47S53HAjuBibzadFRjcrSCvGdPwqTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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