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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06585b31f938b4894dd0076c08b2df6f43d205684aec8b46e4b29ce77525dcd6' 
  AND token = '3fLOdC/Br7K/h1L9AgS0HDwLw9cGQtm+Wbs3wdynRMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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