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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81cf62e8378ee47782b750e108810d0efd5c7e7a016059e976a37dec3df7dc6c' 
  AND token = 'IXsoXu0hOGuTQU6b8LEnBaHiumodw2oU1BlRNdBYa0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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