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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d560c5c3cecbb1925c5897af9dd9da3f6cfc8c1b0ebffc53556100c7d8463cc' 
  AND token = 'k79UHXaCx64gEiRQiGejrnXAjJcsoVtbDcLtpd1hlus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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