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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b09f2fa4c42c69863d6f18c692704de3ca2e978f13923b09fdf487707dd2b88' 
  AND token = 'BdE/w1EOW9WmEJ/ixyG62Cy1xWAAdntElL449JJLkFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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