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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441b25f7b011c1d5784ab9811bbf74a5dcca6dc4bd0f48ce49f81acc76746f89' 
  AND token = 'UCyxA6lHfkbyS7MIbADDFla7/VKELgM5ODuxcTdBZd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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